This section describes how to install the socket authentication plugin. For general information about installing plugins, see Section 5.6.1, “Installing and Uninstalling Plugins”.本节介绍如何安装套接字身份验证插件。有关安装插件的一般信息，请参阅第5.6.1节，“安装和卸载插件”。

To be usable by the server, the plugin library file must be located in the MySQL plugin directory (the directory named by the plugin_dir system variable). 为了让服务器使用，插件库文件必须位于MySQL插件目录（由plugin_dir系统变量命名的目录）中。If necessary, configure the plugin directory location by setting the value of plugin_dir at server startup.如有必要，在服务器启动时通过设置plugin_dir的值来配置插件目录位置。

To load the plugin at server startup, use the --plugin-load-add option to name the library file that contains it. 要在服务器启动时加载插件，请使用--plugin-load-add选项命名包含它的库文件。With this plugin-loading method, the option must be given each time the server starts. For example, put these lines in the server my.cnf file:使用此插件加载方法，每次服务器启动时都必须给出该选项。例如，将以下行放入服务器my.cnf文件中：

[mysqld]
plugin-load-add=auth_socket.so

After modifying my.cnf, restart the server to cause the new settings to take effect.修改my.cnf后，重新启动服务器以使新设置生效。

Alternatively, to load the plugin at runtime, use this statement:或者，要在运行时加载插件，请使用以下语句：

INSTALL PLUGIN auth_socket SONAME 'auth_socket.so';

INSTALL PLUGIN loads the plugin immediately, and also registers it in the mysql.plugins system table to cause the server to load it for each subsequent normal startup without the need for --plugin-load-add.INSTALL PLUGIN会立即加载插件，并将其注册到mysql.plugins系统表中，以便服务器在每次后续正常启动时加载它，而不需要--plugin-load-add。

To verify plugin installation, examine the INFORMATION_SCHEMA.PLUGINS table or use the SHOW PLUGINS statement (see Section 5.6.2, “Obtaining Server Plugin Information”). For example:要验证插件安装，请检查INFORMATION_SCHEMALUGINS表或使用SHOW PLUGINS语句（请参阅第5.6.2节，“获取服务器插件信息”）。例如：

mysql> SELECT PLUGIN_NAME, PLUGIN_STATUS
FROM INFORMATION_SCHEMA.PLUGINS
WHERE PLUGIN_NAME LIKE '%socket%';
+-------------+---------------+
| PLUGIN_NAME | PLUGIN_STATUS |
+-------------+---------------+
| auth_socket | ACTIVE        |
+-------------+---------------+

If the plugin fails to initialize, check the server error log for diagnostic messages.如果插件初始化失败，请检查服务器错误日志中的诊断消息。

To associate MySQL accounts with the socket plugin, see Using Socket Pluggable Authentication.要将MySQL帐户与套接字插件相关联，请参阅使用套接字可插拔身份验证。

The method used to uninstall the socket authentication plugin depends on how you installed it:用于卸载套接字身份验证插件的方法取决于您的安装方式：

The socket plugin checks whether the socket user name (the operating system user name) matches the MySQL user name specified by the client program to the server. 套接字插件检查套接字用户名（操作系统用户名）是否与客户端程序向服务器指定的MySQL用户名匹配。If the names do not match, the plugin checks whether the socket user name matches the name specified in the authentication_string column of the mysql.user system table row. 如果名称不匹配，插件会检查套接字用户名是否与mysqluser系统表行的authentication_string列中指定的名称匹配。If a match is found, the plugin permits the connection. 如果找到匹配项，插件将允许连接。The authentication_string value can be specified using an IDENTIFIED ...AS clause with CREATE USER or ALTER USER.authentication_string值可以使用带有IDENTIFIED...AS子句的CREATE USER或ALTER USER指定。

Suppose that a MySQL account is created for an operating system user named valerie who is to be authenticated by the auth_socket plugin for connections from the local host through the socket file:假设为名为valerie的操作系统用户创建了一个MySQL帐户，该用户将通过auth_socket插件进行身份验证，以便通过socket文件从本地主机进行连接：

CREATE USER 'valerie'@'localhost' IDENTIFIED WITH auth_socket;

If a user on the local host with a login name of stefanie invokes mysql with the option --user=valerie to connect through the socket file, the server uses auth_socket to authenticate the client. 如果本地主机上登录名为stefanie的用户使用选项--user=valerie调用mysql通过socket文件进行连接，服务器将使用auth_socket对客户端进行身份验证。The plugin determines that the --user option value (valerie) differs from the client user's name (stephanie) and refuses the connection. 插件确定--user选项值（valerie）与客户端用户名（stephanie）不同，并拒绝连接。If a user named valerie tries the same thing, the plugin finds that the user name and the MySQL user name are both valerie and permits the connection. 如果名为valerie的用户尝试了同样的操作，插件会发现用户名和MySQL用户名都是valerie，并允许连接。However, the plugin refuses the connection even for valerie if the connection is made using a different protocol, such as TCP/IP.但是，如果连接是使用不同的协议（如TCP/IP）进行的，即使是瓦莱丽，该插件也会拒绝连接。

To permit both the valerie and stephanie operating system users to access MySQL through socket file connections that use the account, this can be done two ways:为了允许valerie和stephanie操作系统用户通过使用该帐户的套接字文件连接访问MySQL，可以通过两种方式完成：

To access the account, both valerie and stephanie specify --user=valerie at connect time.要访问该帐户，valerie和stephanie在连接时都指定--user=valerie。